Presidium® (PGT II) Gem Tester

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The Presidium® Gem Tester II (PGT II) provides users with a quick and easy way to identify diamonds/moissanites and separate up to 16 common colored gemstones based on their thermal properties. It can test both polished and unpolished gemstones.  The probe tip is the industry’s thinnest at 0.06mm (0.024) for testing colored gemstones as small as 0.02ct.   The PGT II was redesigned for the user, and thus has a clear and direct analog display as well as built-in class and calibration discs for reference. Consistent and reliable results every time with no waiting between tests. Replacement pen probe is available. See related products below. Made in Singapore.

*Does not differentiate between natural and synthetic colored gemstones.


  • Retractable thermoelectric probe tip that ensures constant pressure between probe and gemstone.
  • Industry's thinnest probe tip, 0.6mm (.024") for testing gemstones as small as 0.02ct.
  • Metal alert buzzer to ensure that probe tip is in contact with gemstone during testing.
  • Clear and easy-to-read analog dial.
  • Can differentiate between 16 types of gemstones.
  • Built-in glass and Calibration (CAL) test discs for reference.


  • Identifies diamonds/moissanites and most colored gemstones.
  • Tests both polished and unpolished gemstones.
  • Tests gemstones as small as 0.02ct.
  • Consistent and reliable results every time.
  • No waiting time between tests.
  • Simple and easy to use.
  • Runs on 2 AA batteries or adapter (included).
1 Garnet 9 Quartz
2 Tourmaline 10 Amethyst
3 Iolite 11 Citrine
4 Tanzanite 12 Jadeite
5 Aqua 13 Spinel
6 Chrysoprase 14 Topaz
7 Emerald 15 Ruby
8 Nephrite 16 Sapphire

* Please note, Glass, Diamond & Moissanite are not considered a colored gemstone.

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